Drill-grinding fixture



vMmh 1o, 1942. c. H. ERG 2,275,496

DRILL-GRINDING- FIXTURE Filed sept. 27, 1940 4 sheets-sheet 1 INVENTOR /Afar ATTORNEY March l0, 1942. c. H. BERG 2,275,496

DRLLGRINDING FIXTURE Filed Sept. 27, 1940 4 Sheets-Sheet 2 f1/razz 56g BY ATTORNEY March 10, 1942. 'l C, H, BERG 1 2,275,496

DRILL-GRINDING FIXTURE Filed Sept. 27, 1940 4 Sheets-Sheet 3` .BY gaie-@52 ATTORNEY March 1o, 194.2. C, H. BERG 2,275,496

DRILL-GRINDING FIXTURE Filed sept. 2'?, 1940 4 sheets-sheet 4 g1g 4 ,pa /179 C' INVENTOR Y )5f 756g ATTORNEY Patented Mar. 10, 1942 o, UNITED STATES i'rflissriv orifice o DRILL-GRINDING FIXTURE Carl H. Berg, Bloomfield, N. J.

` Application September 27, 1940,"Serial No. 358,579 (C1. 51-219) 21 Claims.

This invention relates to a form of fixture for grinding drills.

It is` one of the `objects of my invention to provide a xture for grinding drills so as to get complete uniformity on the lips `of the drill, for all diierent sizes within the range of the fixture, so that the bearing point of the drill will be at the aXis of the drill, whereby the drill will make a true and uniform hole.'

Another object of my invention is to provide a drill grinding xture which can be quickly set or adjusted so that drills may be groundto any `desired clearance, depending on the material on drillfgrinding fixture which can be set to grind twist `drills and end mills either of the two or four-lip type, and to get onto all of these drills abetter and stronger cutting edge. Another object of my invention is to provide a drill `grinding xture whichcan be quickly set or` adjusted to get a greater range of cutting :angle on the drill than can be obtained with any other drill grinding fixture of which I am aware. `These and other objects and advantages will be readily understood and appreciated by those skilled in this particular art, by reference to the following specification taken in connection with the annexed drawings, wherein: o Figure 1 is a side elevation of the machine. o Figure 2 is a top View of Figure l, with some of the` parts removed. Figure 3 is a view of the upper part of Figure 1, looking from right to left.

Figure 4 is a view of the upper part of the machine, looking from the back side of Figure l.

Figure 5 is a view of the upper part of Figure l, looking from leftto right.

Figure 6 is a View of the upper part of Figure 1, with certain of the parts turned to another position." I A Figure 7 is a view on the line 1 -'I of Figure 2.

Figure 8 is a view on the line 8-8 of Figure 2.

Figure 9 is a view on the line 9 9 of Figure 2. i Figure l0 is a view similar to Figure 9, but with the parts in a diierent position of operation.

Figure 11 is a View on the line I I-II of Figure 6.

Figure 12 is ure 1.`

Figure 13 is a sectional View through the drill chuck.

Figure 14 is aview on the line I4-I4 of Figure 13."

a view on the une Iz-Iz of Fig- In the various views, wherein like numbers remember I Il from which vprojects `a stud II carryfer to corresponding parts, I and 2'are a pair of` relatively adjustable base slides, the numbers referring to the complete slides which aresimilar i to `those found on `various types of machines. These slides are set at right angles to each other and each has its adjusting screw handle 3 and 4, respectively.

The bottom `of the slide I is adapted to be mounted on the bed plate of a drill grinding wheel, and by reason of the slides the drill grinding fixture may be moved to the proper position with respect .to `the grinding wheel. The slide 2 supports the base portion 5 of an arm 6, the portion 5 being held to the slide 2 by a screwstud l.

The portion 5 is provided with a scale 8 which `cooperates with a iinger Si` fastened to the slide 2.

These parts are so associated that the arm 6 can be set to the desiredangle, such as illustrated in Figure 2.

The upper end of the arm has a support ing a roller I2 fastened thereto in any satisfactory manner as by screw I3.` The member I0 is provided with slideways to receive a plate I4 which is slidably mountedin the dovetail guideway. The plate I4 has a projecting hub I5 which, in the normal idle positionof the fixture,

is positioned in a notch or cutout portion I6 inl the support member I0.

The hub `I5 supports a shaft II which extends therethrough. Rotatably mounted on the shaft I'I, is a `cam member \I8. This mounting comprises a slide I 9 through which the shaft I'I passes. A bar 20 is fastened to the edge of the cam I8 as by screws 2|. The bar 20 carries an adjusting screw 22 which is threaded into the slide I9 and has collars 23 on opposite sides of the bar 20, so that when the adjusting screw 22 is turned, the cam I3 is moved laterally with respect to the shaft I1, thereby changing the time at which various portions of the cam I 8` will contact with the roller I2 for the purposes which will be hereinafter described. A part of the adjusting screw 22 is provided with scale divisions which `cooperate with an indicator finger kil` caror sleeve 29 againstthe end of which the portion 26 of the lever bears. AAnother screw 30 assists in holding the plate 26 to the spacing collar, which is provided with a hole 3| to receive the screw 30.

terminating in a plate The spacing collar or sleeve 29 has an arcuate segment cut out, leaving an opening 32 therein, as more clearly s'een in Figure 2. Located within the sleeve and observed through the Vopening 32, is what I term a pickup means which is fastened to the end of the shaft I1. This pickup means includes a spacing collar 33 located on the shaft, and a pair of lock nuts 34 which act to grip a ring 35 carrying a projecting pin 36. The lock nuts 34 are provi'dedzwith holesi31 to rreceive a spanner wrench so that they may be set up tightly against the ring 35 to securely lock it to the shaft I1. The pin 36 projects through the opening 32 in the spacing sleeve and when `the apparatus is in idle position, the pin 36`will contact with the edge 38 of the opening Ain the spacing sleeve 29, but whenthe operatinglever 25 is moved a sufficient amount, as will be later described, the pin 36 will engage the opposite edge 39 of the opening in the sleeve 29 for..apur posetobelater referred to.

.The `innerend ofthe shaft I1, or that `end opposite'the handle 25,;is .threaded .in-toaplate 40 which is .fastened to .or which may'be .an'iny tegral part vof a bracket 4I.

The bracket "4| has an angularly projecting arm 42 which vcarriesa block'43 fastenedthereto by va plurality of screws 44, whichalso act to "hold a-'guide strip T45 'in position. .A complementary guide strip 4:6Lis'fastened "to the opposite :side of the "block 4131by a plurality of screws 41. rBetween these guide strips, is `located a bar '48 which is adjustable longitudinally `of vthe bloc'k l43 'by means of screw49 carriedby Va stud 50 which lis fastened to '.the block l43. '.On the opposite end .of the bar '48,1fromlthe .adjusting screw 49, is .mounted a support member v I which .carries .a plunger 52 on the'lower end of whichis mounted a holder 53.v .The holder .53 .is slotted, andin this slot fis positioned ,agauge finger 54formed as shown in the different views,.andfhaving its inner end attached .as'by pins `55 .to a rod 56 whichfhas a slidable,. detachable engagement 5.1 with :astem 58 ofa gauge '59,.thestemof .which projects within the .plunger .52.

.The holder L53 `.has fastened thereto -anarm 69, to the .end o'f vwhich .is rattached a .spring '.6I, the opposite end of whichiis .attahed'toascrew 62 in rthebar- 4.8. The plunger' 52.1's provided with a -guide groove '63 which cooperates with 'the end of .a .screw `64`1`locked in position'.by.anut"65 in the supllolitlmemberm. .This screw 64 prevents the plunger52ffrom turning in its support member .5.I.. $.The support vmember .5I `carries -a stud 6.6 which pivotally supports .a .'bllcrank Jever V6-1, the .,arm'of .which isslidably positioned inthe head 69 of a pin A1l! slidably carried lin .a .stud 'l I .fastened-tothe supportmember5'l. The. inner end of the `pin C-,engages .a hole orrecess in 'the wall of th'eplungerl52 so as to hold .the :plunger and .indicator .down when .it .is moved Lto lthe gauging p.osition,\.as 'indicated in '.Figure 4l.

.After the `drill Lhas been .set .in the .drill `chuck` 12, :so that .the .gauge .linger lor .clip 54 engages the lip .ofthe drill .where .the uterunsfdown .to the point, then the gauge is returned to its uppermost position :by pr-essingfon the button portion 1.3 of .the bellcrank `lever .61,.it being .understood that a spring ..14 acts on :the head L69 .of .the ypin 1.9 fto .continually urge the pin-towardthe plunger 52, so that v:as .the l.gauge .or .indicator 5.9 is moved downto .the indicatingposition, as previously .described, .it will .be Aautomatically locked in .this position; and when Tit ris freleased "by .the button 13, as described, the spring `6I will return the plunger 52 and gauge 59 to idle position, it being understood that the transverse adjustment of the gauge and other parts for diierent diameters of drills is made by the adjusting screw 49. If desired, a buffer washer I91 may be used to relieve the shock on the gauge when being returned to idle position.

The drill chuck 12 is positioned by and between a plate 'I5 extending from and preferably integral with 'the bracket 4I, and alplate 16 fastened to theI bracket by screws, one of which, 11, is shown in Figure 4. The drill chuck has a main body portion 18 with a hub 19 supported in the plate l15. The body portion 18 carries the drill jaws and 8| which are T-shaped, and each provided `with a groove to receive a projection 62 onthe nuts 83 which are engaged by right and lefthand threads on a screw 84, which is accessible :through either of the orifices or 86. The drill jaws Nand set screw ar-e held in place on the member 18 by a cover'plate 81 which'has av hub portion 88 positioned withinthe support plate 16 whichalso carries la ring 89 which may -be shouldered .as indicated in Figure 13. The ring 89 has an arcuately formed member 90 fastened thereto as by screws 9 I.

The member 99 has a'projection .92'which enters the sleeve 93 of a joint.member.94, which is of the Universal type, the 'other member 95 of which is fastened to the vslide plate I4 which is provided with a stud 96,'to which isfattached one endof a spring 91, the opposite end of which is fastened to a stud 98 fastened to the .bracketf4|.

Attached to the hub 88 of the cover plate 61, is a disc `99 which slightly overlaps the ring 89.

The attachment ofthe disc 99 to the `hub r88 is made by a screw |89 and a stud IGI having .an operating lever |92. The screw |99 is vonly used toposition the disc 99 in arcuateposition and is not screwed up tightly, Awhereas `the .stud |91 .is provided with a shoulder ID3 so "that when the stud I9I is turned up tightly, the disc 99 will clamp the chuck to thering member 69,\and when the shaft I1, carrying'the bracket 4I, is turned, the .chuck and drill will be turned or given an oscillatory motion through the `medium ofthe Universal joint connection .just previously .de' scribed.

From what has been said .as to .the operation of the various parts, the general operation may be briefly stated as follows: When the operating lever 25 is first moved .away from .theoperaton looking at Figure l, the cam ldfengages the roller I2, and this moves the 'slide `plate I4, carrying the hub I5 `andassociated parts together with the bracket 4I and chuck and drill-and .other parts, forward toward the grinding wheels shown :in dotted 'lines G fin Figure 2. As :soon as the approaching edge 39 ofthe sleeve 29 engages the pin 36, the shaft I1 and the bracket 4I will begin to turn and moveto the position shown in Figure '6.

If thestud I9! is set `upto lock the disc`99,:as described, :then the entire lchuck .12 will turn so as .to .arcuately'move the end of the drill .to .get the necessary curved surface forming the cutting angleof `the drill. On completion of this movement, the pressure is released from the handle.25

and the spring .91 will return the bracket and chuck back to their normal position, against .a stop member .fastened to the slideplate Ai4; and a spring l194, positioned within a recess inthe supportmember I9 and .havingoneend fastened thereto While the other end is fastened to the slide plate I4, will return the slide plate I4 and its associated parts to normal position.

When it is desired togrind end mills or other tools which do not require the rotation of the chuck heretofore described, the stud is released so that the disc 99 is free from clamping engagement with the ring 821` and a set screw |05 passes through the support plate 16 intoengagement with the chuck plate 81, thereby lockingthe chuck to its support plates and the bracket 4|.

Another importantfeature of my invention resides in the `chuck portion thereof. During the continued use of the drill chuck, the parts, particularly the screw 84, may become worn sufciently so that the initial setting of the screw 84 andassociated parts may shift enough, when tightening a drill in the chuck, that the axial center of the drill is not in its true center, which means that the drill, when ground under these conditions will drill an eccentric hole.` This eccentricity is disclosed by the gauge 59 at the time of setting the drill, as heretofore explained. For example, when the gauge finger 54 is broughtinto setting engagement with the drill, the gauge should Yread the same `when the chuck is rotated to bring the other'ute or flutes intothe same gauging position, as the first ute.

` Another way of checking the position of the chuck jaws and other parts is to use a round rod which has been checked and held as a gauging member. If the chuck members are in proper position, there will be no change in the gauge readings, as the chuck is turned to move the gauge rod against the end of the gauge finger 54. If any variation is found, then the chuck jaws 80 and 8| may be shifted laterally in the chuck by means of clips |08 fastenedto the cover 81 as by a screw |09, it being understood that there is a corresponding clip |08 on the opposite side of the chuck. The clips |08 engage rectangularshaped blocks I 0 in which the ends of the screw 84 are located. By loosening the clip |08 on the side of the chuck, and readjusting the screw 84 through, for example, the hole 85, the chuck jaws will be shifted with respect to the axial center of the chuck. `When the proper position is found, the clip |08 is tightened into position to grip its associated block H0. If the eccentricity is in the opposite direction, then the opposite adjustment will be made.

From the construction herein disclosed, it will be seen that I have obtained a drill grinding iixture` which can be set so as to get a change in the cutting angle` of from approximately four to fifteen degrees, whereas ordinary drill grinders only have a range of from about twelve to fifteen degrees. I can also get a clearance angle of from thirty to ninety degrees, which is much greater than on any of the drill grinders of which I am aware. These, together with the other advantages which are obtained,` result from the construction described, certain details of which may be varied Without departing from the spirit of my invention or the scope of the appended claims.

I claim:

1. In a drill-grinding fixture, a pair ofrelatively adjustable base slides mounted, one above the other, an arm rotatably carried on the upper of said slides, a support member on the arm, a plate slidably mounted on said support, a hub projecting from said plate, a shaft supported by the hub and extending therethrough, a` cam rotatably mounted on one end of the shaft adjacent said hub, an operating lever mounted to turn the cam, a roller carried by the support member l, furtherdened in that said pickup means comand adapted to be engaged by the cam when turned by said lever to move said plate, hub, shaft, cam and lever bodily forward, a bracket carried on the end of said shaft opposite to said `lever and rotatable therewith, a drill chuck to take a drill carried by said bracket, and pickup means fastenedto the shaft and disposed between the cam and lever mounting for` turning the shaft, bracket, chuck and drill after a predetermined movement of the cam.

2. A drill-grinding fixture as set forth in claim l, further defined in that means are provided for adjusting the cam transversely of the shaft for the purpose described. i

3. A drill-grinding fixture as set forth in claim prises a sleeve inter-posed between `the lever and cam, the sleeve having an arcuate segment cut away and a ring fastened to the shaft and hav` ing a pin projecting through the opening made by the :cut-out sleeve segment, the pin being engaged by a w-all of the sleeve as this is moved by the lever succeeding the sliding movement ofthe plate.

4. A drill-grinding fixture as set forth in claim 1, further dened in that said bracket has a projecting arm, an adjustable member supported by the arm, a plunger slidably carried lby a part of said adjustable member, a `gauge :carried by the plunger and having an operating stem extending downwardly within the plunger, a holder on the lower end of the plunger, a drill-setting finger carried by the holder and operatively connected to the gauge stem within the plunger, means for arcuately positioning the plunger, means for holding the plunger and parts carried thereby in drill-setting position after having been moved thereto, and means for releasing the holding means and returning the plunger with its Iparts to normal position.

5. A drill-grinding fixture as set forth in claim 1, further defined in that said bracket carries `a gauge and a drill-setting linger operatively connected to the gauge, with means for adjusting the location of the setting linger with respect to Ia drill carried by the chuck. l

6. A drill-grinding fixture as set forth in claim l, further deiined in that said bracket carries Ia gauge and a drill-setting finger operatively connected to the gauge, with means for adjusting the location of the setting finger with respect to a` drill carried bythe chuck, with further means` for holding the drill-setting iin-ger in a setting position when it is moved thereto.

7. A drill-grinding fixture as set forth in claim 1, `further dened in that said bracket carries a gauge and a drill-setting finger operatively connected to the orauge, with means for adjusting the location of the setting finger with respect to a 9. A drill-grinding fixture as set forth in claim 1, further dened in that said bracket has a pair of laterally spaced parallel plates, at least one of which is detachable, said chuck being rotatably supported between said plates, and means for imparting a rotary motion to the chuck when the saidvshaftis given a rotarymotion asfdescribed.

510. A v drill-'grinding 'fixtureas setforth-inclaim 1, 4further defined in "that saidbra'cket 'has a "pair of laterally 'spaced parallel plates, `atleast one of which isd'etachabla said chuck`being rotatably supported between said plates, a ring positioned around one endo'f the chuck, a 'connection including a type of' Universal joint Vbetween the ring and lsaid slidable plate, and means for clamping the ring to the chuck when it is ydesired to have Ithe `chuck turn at `the 'Sametime with the bracketfor usual drill grinding.

`1 l. A drill-grinding `hxturelas set forthin `claim 1, further defined in that said brackethas'a pair of laterally spaced parallel plates, at least one of which is detachable, said chuck being supportedA 'desired'to grind certain types of drills.

12. In a drill-grinding fixture, base 'support means for the fixture, an arm -adjustably carried by a part of s-aid base support means, a support member `carried by the arm, a plate slidably mounted on said support, |a shaft supported by the plate, a bracket attached to one end of the shaft, a cam lrotatably mounted on the other` end of the shaft, operating means connected 'to the cam, means `positioned vto be engaged by said cam to force it and the shaft, plate and bracket laterally according to the contour of the cam, a drill Ichuck carried by said bracket, and pickup means fastened tothe shaft and disposed between the cam and said operating means for turning the shaft and parts fastened thereto Fafter a predetermined movement of the cam.

l13. A drill-grinding .'xture as set forth in claim 12, further defined in that the vcam is carried on a transverse block through which said shaft passes, the cam and blockhaving cooperative means for adjusting the cam laterally on the block.

14. .A.drill-grindingxture asset forth in claim 1-2, further defined in that the operating kmeans for the cam includes a sleeve fastened to the cam vand a .leverfastened to the sleeve, the sleeve having an opening in its wall, the `sides oi the opening acting to engage a pin operatively connected to 'the shaft and serving with the :sleeve as'said vpickup means.

125. .A drill-grinding fixture as set'forth in claim 12,'furth'er defined in that said bracket has an arm and a gauge support and adjusting mechanism including a nger mounted so as to be moved to engagea drill vcarried b-y the chuck at the proper place to properly position the drill When placed in .the chuck.

i6. A drill-grinding fixture as set forth in claim 12,` further defined in that said bracket has an arm and a gauge support and adjusting mechanism including a plunger mounted for vertical movement and carrying a gauge on Ythe upper end anda setting :finger fatthe lower end, the Ss'aid finger being operativelylconnected to f the opeifating stem fof the gauge, as and for 'the purpose described. f

17. Adrill-grindingxtureas set fo'rthui'n claim 12, vfurther defined in thatsaidbr'acket'has an arm anda gauge support vandfadjusting mechanism including a plunger non-'rotatable ,but slidable vertically and carrying a gauge at vone `end andra setting nger atth'eother end,and means for holding the plunger lin a depressed position when so lmoved Ito .bring the finger into setting engagement with a drill .in the chuck, and means for .releasing and returning the plunger to inondrill `setting position.

.18. A drill-grindingi'ixture a'sset forth infclair'n 12, further dened 'in that the chuck Tis -carri-d by the bracket ysoit 'maybe given arotary motion, and means `for imparting to the :chuck a rotary motion simultaneous with rotation of the bracket, and further means lfor holding the chu'ckfr'om turning when it 'is desired to grindfcerta'in 'tools as described.

19. A'drill-grinding fixture 'as set forthv in 'claim 12, further dened'in `that'th'e bracket has Va vpair of spaced 'parallel plates extending therefrom, while the chuck'hasoppositelydisposedhubs eX- tending in the plates for V'rotation therein, 'and means `including `a compensating type fof connection between the chuck and 'the "slidable plate togive the chucka rotary ymotion when t'heislidable plateis moved to its full drill-grinding position coincident with the turning fof the bracket.

29. For usein a drill-grinding 'fixture .asherein .Y described, a chuck having a single-piece main body portion having in one face 'a transverse channel therein displaced `from the axis Vof 'the chuck and carrying oppositely threaded 'nuts in spaced relation .in saidchannel, eachnut-having a'projectionthereon and afscrew withlright and lefthand threads to 'fit said inuts and T-shaped drill jaws 'each jaw having a groove in the bearing stern of the T 'to receive 'the projection-oni'ts cooperative nut, a` single 'fcover t'o I-hol`d the nut and jaws in position Vin -the body iper-tion, bo'th the body and cover having "hub portions for Lrotatably mounting the chuck `in'a fixture fpart, a one-piece, vcontinuou'sring fitting `'one end of ithe chuck and 'having means for rotating 'the ring, and means overlapping the edge of the .Lr'ing fo'r locking vthe ringr to the chuck forthe purpose 5described.

21. In a chuck as set `forth in 'claim 20,!further defined in that means A'arep-rovided onthe chuck for adjusting the screw and nuts carried lthereby longitudinally ofthe channel, thereby movingthe chuck `jaws accordingly to compensate for wear on these parts, whereby the members Ato 'be held in the chuck for grinding are truly 'centered in the chuck,

CARL H. BERG. 

